I gave it a quick sand with 600 grit, wiped it down with a tack cloth, then again with naphtha on a microfiber cloth. The clear coat didn't turn out as smooth as I'd want a finish coat to be (pretty orange peely), but I think that's because I was trying to keep it as light as possible and didn't spray enough for it to even out.
I didn't want to take everything off the play field, so I did a lot of masking instead. I found that 3/8" PVC tubing is a perfect fit for most of the bulb and contact switch holes, so I just cut lengths of that and taped the top shut.
Now that the initial coat is on, do I need to sand a little before doing touch up work? If so, should I sand everything, or just the areas that will be painted? I'm assuming everything will need a quick 600 grit sand again before the final 2-3 clears go on.